Extended Data Figure 4: Stellar velocity data and best-fit dynamical model.
From: A 17-billion-solar-mass black hole in a group galaxy with a diffuse core
These data are shown for NGC 1600 (filled grey and orange circles, with 1σ error bars), together with the best-fit model (smoothed over 0.05 dex in log radius; solid red curves). Observed LOSVDs of galaxies are approximately Gaussian and are commonly parameterized by a Gauss–Hermite series expansion62,63. The mean stellar velocity v (in a) and velocity dispersion σ (in b) correspond to the centre and the width, respectively, of the best Gaussian approximation. Higher-order Hermite coefficients hn (in c–f) quantify deviations from a pure Gaussian LOSVD. Most data points at r < 4 arcsec came from our GMOS IFS observations (orange dots). Data at larger radii came from our Mitchell IFS observations (grey dots).
